package com.heima.admin.gateway.filter;


import com.heima.admin.gateway.util.AdminJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        // 2、判断当前请求是否需要登录
        boolean contains = request.getURI().getPath().contains("/login");
        if(contains){
            // 如果请求路径包含 /login，则调用 chain.filter(exchange) 继续执行后续的过滤器链，否则获取token
            return chain.filter(exchange);
        }

        // 3、获取token
        String token = request.getHeaders().getFirst("token");

        // 4、检查token
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete(); // 结束响应
        }

        try {
            // 5、判断token是否有效
            Claims claimsBody = AdminJwtUtil.getClaimsBody("token");
            int status = AdminJwtUtil.verifyToken(claimsBody);
            if(status==1||status==2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete(); // 结束响应
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 6、放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
